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RedPlate RP50R Operations Guide
1. When new 6L6 GC output tubes are installed it is important to re-bias the amp for optimal
performance in the FIXED (50 WATT) mode. No biasing needed for 6V6 tubes because
they can only be used in cathode bias position.
2. ALWAYS HAVE A SPEAKER CONNECTED.
3. Use a volt meter set to DC volts at lowest scale (MV). Makes sure the black lead is the
common terminal of the meter and the read lead is the DC voltage terminal of the meter.
4. Place the Amplifier in operate mode with the Master Volume and Reverb controls set to
zero.
5. Set the 50 WATT/ 40 WATT switch to the 50 WATT position.
6. Place the red meter lead in the test point hole (red tip jack) And touch (or clip) the black
meter lead on one of the metal output tube retainer clips.
7. Use a small flat blade screwdriver to adjust the bias pot for a reading of 72MV ± 5 MV (FYI
- the plate voltage is 470 volts). The reading is the sum of the idle current for both tubes.
8. Recheck the reading after 10 minutes of operation, and again after a week or two of
operation.
At RedPlateAmps we pride ourselves making products that are built to last. The workmanship
in your RedPlate amplifier is warranted to be problem free for the lifetime of the original owner. The
actual electrical components in your amplifier are warranted for a period of 3 years. Exclusions are
vacuum tubes, reverb tanks, cables, speakers and cosmetics which are warranted for 30 days.
Improper handling or product misuse or product abuse or unauthorized repair work or unauthorized
modifications may nullify your warranty. Eligibility for coverage and covered items are at the sole
discretion of RedPlateAmps.
RedPlateAmps
www.RedPlateAmps.com
email:
info@RedPlateAmps.com
Thanks again for joining the RedPlate Family – Henry
BIAS PROCEDURE
RedPlateAmps Warranty
6
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